/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.eagle.log.entity.meta;

import org.apache.eagle.common.ByteUtil;

public class DoubleArraySerDeser implements EntitySerDeser<double[]>{

	public DoubleArraySerDeser(){}

	private final int SIZE = 8;
		@Override
		public double[] deserialize(byte[] bytes){
			if((bytes.length-4) % SIZE != 0)
				return null;
			int offset = 0;
			// get size of int array
			int size = ByteUtil.bytesToInt(bytes, offset);
			offset += 4;
			double[] values = new double[size];
			for(int i=0; i<size; i++){
				values[i] = ByteUtil.bytesToDouble(bytes, offset);
				offset += SIZE;
			}
			return values;
		}
		
		/**
		 * 
		 * @param obj
		 * @return
		 */
		@Override
		public byte[] serialize(double[] obj){
			if(obj == null)
				return null;
			int size = obj.length;
			byte[] array = new byte[4 + SIZE*size];
			byte[] first = ByteUtil.intToBytes(size);
			int offset = 0;
			System.arraycopy(first, 0, array, offset, first.length);
			offset += first.length;
			for(int i=0; i<size; i++){
				System.arraycopy(ByteUtil.doubleToBytes(obj[i]), 0, array, offset, SIZE);
				offset += SIZE;
			}
			return array;
		}

	@Override
	public Class<double[]> type() {
		return double[].class;
	}
}
